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人体组织器官的结构和功能,是随着年龄的增长而不断变化的。这些变化主要是由两个对立统一的生命活动——生长和衰退组成。在青、壮年时期,生长过程是主要方面,随着年龄的增长,衰退过程就逐渐出现。年龄增长是一个持续过程,各组织器官的生理功能衰退发生时间和发展速率参差不一。比如人的体力和脑力在出生后持续升高,最初体力发展比脑力快,到20岁前后达到顶点,而后就逐渐降低。脑力的发展则在20岁后持续提高,一般到40~60岁最成熟。此后如需保持脑力的活跃,必须依靠两个因素:一是尽量维持原来的脑
The structure and function of human tissues and organs is constantly changing with age. These changes are mainly composed of two opposite life activities - growth and decline. During the prime of life, the growth process is the major aspect. With age, the recession gradually emerges. As the aging process is a continuous process, the physiological functions of various organs and organs decline in time and rate of development varies. Such as human physical and mental strength continued to rise after birth, the initial physical development faster than the brain, reaching the peak before the age of 20, and then gradually decreased. Mental development continues to increase after the age of 20, the most mature to 40 to 60 years old. To maintain mental activity thereafter, we must rely on two factors: First, try to maintain the original brain